Answer:
a. Detecing a specific mutation allows for pheonotypic abnormalities to be identified faster
Explanation:
When a human being has a complex condition, this may be due to a genetic disorder, for example, deleterious mutations in their DNA.
In order to identify if a pathology or condition is related to genetic factors and, specifically in order to detect the gene or genomic regions involved in that condition, genome comparison is a very useful and valuable tool.
When two genomes are compared, differences between them can be detected. The comparison of the genome of a person with no condition with the genome of a human with a complex condition allows to recognize mutations (factors) in the person with the complex condition that may be involved in such condition.